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I doubt you will find that. Some people have gutted the catalytic converters and then you could cut the stock H pipe section out and install a Corsa, Bassani, or other brand X pipe section. I think that's as close as you're going to get.
Honestly, going with a good LT header/x-pipe system would be the better choice.
You can get a nice bump in power with the LTs. Also there is no reason to delete the cats unless you are tracking the car. The high flow metal matrix cats that come on the aftermarket X pipes really don't cost you that much HP. There are some decent LTs out there that are a little more affordable than the name brands if price is a concern.